Mechanical perpetual calendar.



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.110. 877,335. PATENTED JAN. 21, 1908.

MECHANICAL PERPETUAL CALENDAR.

APPLICATION FILED DEG. 29.1906.

2 SHEETSSHEET 2.

I90! to 2000 F l G3- ea-Q2 Mr PATENT OFFICE.

MECHANICAL PERPETUAL CALENDAR.

Specification of Letters Patent.

Patented Jan. 21, 1908.

Application filed December 29. 1906. Serial No. 349-928.

To all whom it may concern:

Be it known that 1, JAMES 'SINCLAIR HErrHERsAY, a subject of the King ofGreat Britain and Ireland, residing at 59 South Terrace, Adelaide, Stateof South Australia,

Commonwealth of Australia, have invented a certain new and usefulImproved Mechanical Perpetual Calendar, of which the following is aspecification.

This calendar consists of three plates or disks united by a centralpivot pin, all of said plates or disks carrying printed matter anderence to the accompanying drawings in.

which Figure 1 shows the calendar set for the months of September andDecember of the years 1905, 1922, 1939, 1972, and 1989'. Figs. 2, 3 and4 show the several plates or disks separately.

Fig. 2 represents what may be called the fixed or main plate'A. Thisplate has in addition to the central hole for the pivot pin, twoopenings B and C, and bears upon its face the names of the months withthe numbar of days in each arranged around portion of the upper edge ofthe opening C. Immediatelyadjacent to the opening B are the words Setfor years and the remainder of the surface may be utilized to displayadvertising matter. The opening B is of the requisite shape and size topermit the number of the year required (printed on the disk K) to beread. The opening C is are shaped with projecting slots at the lowerends.

Fig. 3 re resents the front rotatable disk D. This disk has in additionto the central hole for the pivot pin, three openings E, F and H, andbears upon its face the numerals 1 to 31, arranged around portion-of thelower edge of the opening F. Immediately adjacent to the opening E arethe words Set formonth, and immediately around the upper edge of theopening F are the Words Years and months (Jan. Feb.) printed in red arefor leap year only. The opening E is of the requisite shape and size topermit the names of the months (printed on the plate A) to be read. Theopening F is are shaped and of sullicient extent to permit the names ofseven days of the week (printed on the disk K)' to be readsimultaneously. The opening H is also are shaped and very narrow, itspurpose being to ma e a tongue of the central portion of the disk.

. Fig. 4 represents the back rotatable disk K. This disk has no openingexcept that for the central pivot pin, but it bears upon its face, in acircular table, the numbers of the years for which the calendar isdesigned to be used and also, in a circle, the names of the days of theweek repeated three times. I

This calendar may be made .to apply to any number of years without anyalteration to the main plate and the front rotatable disk, the onlyalteration necessary being in the printed matter upon the back diskwhich bears the numbers of the years. In the illustration this diskbears the numbers from 1901 to 2000. It might for instance be made tocover the years 1901 to 1925 or any other set of years desired.

The three parts of the calendar are put toether thus. The disk D isplaced upon the ont of the plate A and its lower edge slipped down underthe tongue or central part of the plate A, but the tongue or centralpart of the disk is kept over the tongue of the plate. The disk K isplaced at the back and the three parts connected by a rivet or otherivot in. The movement of the disk D is imite by the ends of the areshaped 0 ening H coming against the lower edges 0' the opening C in theplate A.

In order to use the calendar, the back disk is rotated until the yearrequired shows through the opening B at the top of the main plate A, theintermediate disk D is then rotated until the month required showsthrough the opening E in the front rotatable disk and the calendar isthen ready for use.

The leap year numbers and the months of January and February for thesame are indicated on the drawings by dotted figures and letters. In theactual calendar they may be indicated by a distinctive colored ink orthe Words Leap year may be printed beneath and a disk having an opening,an arc-shaped openingbelow the-first nahied and.

' a second arc-'shaped'opening fonn' nga o'w'nwardly P ject g al o e; tho r. portionof the (118k? extending throu' h-the 5v arc-' hapedopening'of the latea'nd a'ving its tongue projecting over t e. tongue ofthe said plate and pivoted thereto. i a

2'. A perpetual calendar; comprising" a! plate havin 'the names of themonths with the numbers of days in each month produced thereon andprovided with an o ening and below said opening an arc-shape opening,said arc-shaped opening having downwardly and outwardly projectingextensions at its ends and forming a central upwardly projecting tongue,a disk having numerals 1 to 31- pro uced thereon and provided with anopening, an arc-shaped opening below the first named opening, and asecon arc-shaped 20 opening forming a downwardly projecting oven thetongu 'forate}disk' at the back-of the plate and hav- 1 e, thealqwnportion-ot-th disk r ug 1 19 ar -vs ap p ning 2 P a d5 t Q proiee efofthe-jsaid'p ate, an imporin t 'e number-ofthe years for which the caendar-is used and the names ofthe days of the week repeated three timesproduced thereon, and a pivot passingft ough the 1 said disk and thetongues of the plate and the first named disk. I

In testimon :that I claim the foregoing as my invention have signedmyname in the presence of two subscribing witnesses this twenty-firstdayof November 1906.

JAMES SINCLAIR HEITHERSAY.

Witnesses:

ARTHUR GORE COLLISON,' LESLIE HERBERT BROADBENT.

